internal static void WriteLzmaProperties(LzmaEncoder encoder)
{
#region LZMA properties definition
CoderPropID[] propIDs =
{
CoderPropID.DictionarySize,
CoderPropID.PosStateBits,
CoderPropID.LitContextBits,
CoderPropID.LitPosBits,
CoderPropID.Algorithm,
CoderPropID.NumFastBytes,
CoderPropID.MatchFinder,
CoderPropID.EndMarker
};
object[] properties =
{
_lzmaDictionarySize,
2,
3,
0,
2,
256,
"bt4",
false
};
#endregion
encoder.SetCoderProperties(propIDs, properties);
}
static void Main(string[] args)
{
var coder = new LzmaEncoder();
long inputSize = 0;
long outputSize = 0;
using (var inStream = File.OpenRead(@"c:\tmp\test.tar"))
using (var outStream = File.Create(@"c:\tmp\test.lzma"))
{
var coderProperties = new Dictionary <CoderPropID, object>()
{
{ CoderPropID.DictionarySize, 1024 * 1024 }
};
coder.SetCoderProperties(coderProperties);
coder.Code(inStream, outStream, -1, -1, new ConsoleProgress(inStream.Length));
inputSize = inStream.Length;
outputSize = outStream.Length;
}
Console.WriteLine();
var ratio = Math.Round((double)inputSize / (double)outputSize, 2);
Console.WriteLine("Input Size: {0}", inputSize);
Console.WriteLine("Output Size: {0}", outputSize);
Console.WriteLine("ratio: {0}", ratio);
Console.WriteLine("=============== All done ===============");
long x = -1;
ulong y = (ulong)x;
Console.WriteLine(y);
Console.ReadKey();
}
public void LzmaCompressAndDecompressShouldBeOk()
{
var source = this.CreateCompressionSourceData();
byte[] compressedBytes = null;
byte[] properties = null;
var encoderProperties = new Dictionary <CoderPropID, object>()
{
{ CoderPropID.DictionarySize, 1024 * 512 } //512kb
};
using (var inputStream = new MemoryStream(source, false))
using (var outputStream = new MemoryStream())
using (var propertiesStream = new MemoryStream())
{
var encoder = new LzmaEncoder();
encoder.SetCoderProperties(encoderProperties);
encoder.WriteCoderProperties(propertiesStream);
properties = propertiesStream.ToArray();
encoder.Code(inputStream, outputStream, -1, -1, null);
compressedBytes = outputStream.ToArray();
Assert.NotEqual(source, outputStream.ToArray());
}
using (var inputStream = new MemoryStream(compressedBytes, false))
using (var outputStream = new MemoryStream())
{
var decoder = new LzmaDecoder();
decoder.SetDecoderProperties(properties);
decoder.Code(inputStream, outputStream, compressedBytes.Length, source.Length, null);
Assert.Equal(source, outputStream.ToArray());
}
}
/// <summary>写入数据并压缩</summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="count"></param>
public override void Write(byte[] buffer, int offset, int count)
{
if (_Mode != CompressionMode.Compress)
{
throw new InvalidOperationException();
}
if (_Encoder == null)
{
_Encoder = new LzmaEncoder();
#region 计算压缩等级
CoderPropID[] propIDs =
{
CoderPropID.DictionarySize,
CoderPropID.PosStateBits,
CoderPropID.LitContextBits,
CoderPropID.LitPosBits,
CoderPropID.Algorithm,
CoderPropID.NumFastBytes,
CoderPropID.MatchFinder,
CoderPropID.EndMarker
};
object[] properties =
{
(Int32)1 << Get(_Level, 0, 29),
(Int32)2,
(Int32)3,
(Int32)0,
(Int32)2, // Algorithm
(Int32)256, // NumFastBytes
"bt4", // MatchFinder MF
false // EndMarker EOF
};
//object[] properties =
//{
// (Int32)Get(_Level, 0, 29),
// (Int32)Get(_Level, 0, 4),
// (Int32)Get(_Level, 0, 8),
// (Int32)Get(_Level, 0, 4),
// (Int32)Get(_Level, 0, 2), // Algorithm
// (Int32)Get(_Level, 0, 128), // NumFastBytes
// "bt4", // MatchFinder MF
// false // EndMarker EOF
//};
#endregion
_Encoder.SetCoderProperties(propIDs, properties);
_Encoder.WriteCoderProperties(BaseStream);
// 8字节长度
BaseStream.Write(BitConverter.GetBytes((Int64)0));
}
var ms = new MemoryStream(buffer, offset, count);
_Encoder.Code(ms, BaseStream, -1, -1, null);
}
/// <summary>
/// Compresses the given stream and writes to the output stream.
/// </summary>
/// <param name="inStream">The input stream.</param>
/// <param name="outStream">The output stream.</param>
/// <param name="progress">The progress callback, if desired.</param>
public static void Compress(Stream inStream, Stream outStream, ICodeProgress progress = null)
{
lock (m_EncoderLock)
{
if (m_Encoder == null)
{
m_Encoder = new LzmaEncoder();
m_Encoder.SetCoderProperties(propIDs, properties);
}
m_Encoder.WriteCoderProperties(outStream);
long fileSize = inStream.Length;
for (int i = 0; i < 8; i++)
{
outStream.WriteByte((Byte)(fileSize >> (8 * i)));
}
m_Encoder.Code(inStream, outStream, -1, -1, progress);
}
}
public static void Compress(Stream inStream, Stream outStream)
{
BinaryWriter writer = new BinaryWriter(outStream);
//writer.WriteNucleusHeader();
//writer.WriteNucleusLZMAHeader();
//writer.Flush();
LzmaEncoder encoder = new LzmaEncoder();
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
long fileSize = inStream.Length;
for (int i = 0; i < 8; i++)
{
outStream.WriteByte((byte)(fileSize >> (8 * i)));
}
encoder.Code(inStream, outStream, -1, -1, null);
}